High performance white light-emitting OLED device

Abstract

A broadband-emitting OLED device having an anode and a cathode spaced from the anode includes a first light-emitting layer provided over the anode and containing a first host material and a first light-emitting material, wherein the first host material is a mixture of one or more mono-anthracene derivatives and one or more aromatic amine derivatives, wherein the mono-anthracene derivative(s) being provided in a volume fraction range of 5% to 50% relative to the total host volume, and the aromatic amine derivative(s) being provided in a volume fraction range of 50% to 95% relative to the total host volume, and a second light-emitting layer provided over or under the first light-emitting layer.

1. A white light-emitting OLED device having an anode and a cathode, comprising:
 a) a first light-emitting layer provided over the anode and containing a first host material and a first light-emitting material, wherein the first host material is a mixture of one or more mono-anthracene derivatives and one or more aromatic amine derivatives, wherein the mono-anthracene derivative(s) being provided in a volume fraction range of 5% to 50% relative to the total host volume, and the aromatic amine derivative(s) being provided in a volume fraction range of 50% to 95% relative to the total host volume, and wherein the first light-emitting material has a peak emission in the yellow to red portion of the spectrum; and 
 b) a second light-emitting layer provided over or under the first light-emitting layer, wherein the second light-emitting layer has a peak emission in the blue to cyan portion of the spectrum, whereby white light is produced by the OLED device. 
 
     
     
       2. The white light-emitting OLED of  claim 1  wherein the second light-emitting layer contains a second host material and a second light-emitting material, wherein the second host material includes one or more mono-anthracene derivatives. 
     
     
       3. The white light-emitting OLED of  claim 2  wherein the same mono-anthracene derivative(s) are used in the first and second host materials. 
     
     
       4. The white light-emitting OLED of  claim 2  wherein at least one of the mono-anthracene derivatives of the first or second host materials includes: 
       
         
           
           
               
               
           
         
       
       wherein:
 R 1 -R 8  are H; 
 R 9  is not the same as R 10 ; 
 R 9  is a naphthyl group having no fused rings with aliphatic carbon ring members; and 
 R 10  is a biphenyl group having no fused rings with aliphatic carbon ring members; and 
 provided that R 9  and R 10  are free of amino and sulfur substituents. 
 
     
     
       5. The white light-emitting OLED of  claim 2  wherein at least one of the mono-anthracene derivatives of the first or second host materials includes: 
       
         
           
           
               
               
           
         
       
       wherein R 1 , R 2 , R 3 , R 4 , R 5 , and R 6  represent one or more substituents on each ring and each substituent is individually selected from the following groups:
 Group 1: hydrogen, or alkyl of from 1 to 24 carbon atoms; 
 Group 2: aryl or substituted aryl of from 5 to 20 carbon atoms; 
 Group 3: carbon atoms from 4 to 24 necessary to complete a fused aromatic ring of anthracenyl, pyrenyl, or perylenyl; 
 Group 4: heteroaryl or substituted heteroaryl of from 5 to 24 carbon atoms as necessary to complete a fused heteroaromatic ring of furyl, thienyl, pyridyl, quinolinyl or other heterocyclic systems; 
 Group 5: alkoxylamino, alkylamino, or arylamino of from 1 to 24 carbon atoms; and 
 Group 6: fluorine, chlorine, bromine or cyano. 
 
     
     
       6. The white light-emitting OLED of  claim 2  wherein the second host material further includes one or more aromatic amine derivatives wherein the mono-anthracene derivative(s) being provided in a volume fraction of greater than 85% and less than 100% relative to the total host volume, and the aromatic amine derivative(s) being provided in a volume fraction of greater than 0% and less than 15%. 
     
     
       7. The white light-emitting OLED of  claim 6  wherein the same aromatic amine derivative(s) are used in the first and the second host materials. 
     
     
       8. The white light-emitting OLED of  claim 1  wherein the first light-emitting material is [a} selected from: 
       
         
           
           
               
               
           
         
       
       wherein for structure ia), A 1 -A 6  represent one or more substituents on each ring and where each substituent is individually selected from one of the following:
 Category 1: hydrogen, or alkyl of from 1 to 24 carbon atoms; 
 Category 2: aryl or substituted aryl of from 5 to 20 carbon atoms; 
 Category 3: hydrocarbon containing 4 to 24 carbon atoms, completing a fused aromatic ring or ring system; 
 Category 4: heteroaryl or substituted heteroaryl of from 5 to 24 carbon atoms including thiazolyl, furyl, thienyl, pyridyl, quinolinyl or other heterocyclic systems, which are bonded via a single bond, or complete a fused heteroaromatic ring system; 
 Category 5: alkoxylamino, alkylamino, or arylamino of from 1 to 24 carbon atoms; or 
 Category 6: fluoro, chloro, bromo or cyano. 
 
     
     
       9. The white light-emitting OLED of  claim 2  wherein the second light-emitting material is selected from a derivative of perylene. 
     
     
       10. The white light-emitting OLED of  claim 2  further including an organic layer disposed over the first and second light-emitting layers, wherein the organic layer includes an electron-transporting material and a mono-anthracene derivative, and wherein the mono-anthracene derivative is present in an amount up to 50% by volume of the organic layer. 
     
     
       11. The white light-emitting OLED of  claim 10  wherein the organic layer includes a light-emitting material, thereby providing a third light-emitting layer. 
     
     
       12. The white light-emitting OLED of  claim 11  wherein the third light-emitting layer has a peak emission in the yellow to green portion of the spectrum.